What does the PCV system do under boost?
05-17-2005, 02:47 PM
#1
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Join Date: Sep 2002
Location: plano texas
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What does the PCV system do under boost?
I know the vacuum from the engine pulls unburnt gases from the crankcase but under boost does the pcv cap off the crankcase from the plenum so the crankcase cannot be pressurized? If it doesnt what can be dont to keep the boost from pressurizing the crankcase?
05-17-2005, 08:42 PM
#2
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Location: Frederick, MD
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Re: What does the PCV system do under boost?
The PCV valve is a one way check valve by design, but it was never intended to prevent the backflow of pressurized air as in the case of artificial aspiration. It is not a positive seal, and some boost does go in the crankcase.
This can cause or aggravate oil leaks at a minimum. For those of us with Powerdynes, it is also a source of lost boost.
It is easy enough to correct though. I am using a brass pcv valve with a viton seal in it specifically for boosted applications. I got it from Ramchargers, and it's for a buick gn. It works great.
You can also put a one way vacuum check valve in line with your pcv that will do the same thing. They are commonly used in the line to power brake boosters in many cars.
Rog
This can cause or aggravate oil leaks at a minimum. For those of us with Powerdynes, it is also a source of lost boost.
It is easy enough to correct though. I am using a brass pcv valve with a viton seal in it specifically for boosted applications. I got it from Ramchargers, and it's for a buick gn. It works great.
You can also put a one way vacuum check valve in line with your pcv that will do the same thing. They are commonly used in the line to power brake boosters in many cars.
Rog
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